IR232, Infrared to RS-232 Converter - $79

IR232 Enclosure - $10

The Industrologic IR232 is an infrared to RS-232 converter that is based on the 12
bit Sony SIRCS protocol. In addition to being able to send and receive control
codes to and from the infrared and RS-232 ports, it can also be configured to send
specific character strings to the serial port when selected infrared codes are received.
This will allow it to act as a host and controlling device to any slave device that
can accept RS-232 commands.

Note: The included RS-232 cable is used to connect the IR232 to a computer to
perform setup procedures. If the IR232 will be communcating with another
device that normally connects to a computer, a "null modem" cable or adapter
will be needed to change the pinout of the connection.